Patents by Inventor Hans P. Wahl

Hans P. Wahl has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Agent and process for the determination of calcium
    Patent number: 4871678
    Abstract: An agent and process are used for the determination of calcium in liquids. The agent contains essentially orthocresolphthalein complexone, an acid and a zwitterionic buffer and is characterized in that the buffer contains at least one sulphonic acid amine of the general formula ##STR1## wherein R.sub.1 and R.sub.2 are identical or different and denote H or alkyl, hydroxyalkyl or cycloalkyl having in each case up to 8 C atoms andR.sub.3 denotes alkyl or hydroxyalkyl having up to 8 C atoms.
    Type: Grant
    Filed: April 24, 1986
    Date of Patent: October 3, 1989
    Assignee: Beschrankter Haftung
    Inventors: Hans P. Wahl, Uwe Wurzburg